I don't know if anybody else has noticed this, but on the song Undertow, just before Leonard joins in, one can hear a rather sustained car horn honking in the background! This was the first time I'd noticed it, but I was listening to it on my i-Pod on a very quiet morning, and one tends to hear these little things in the intimacy of one's head. At first I wondered if the sound came from outside my house, but no, it came from outside Leonard's house (or his garage, or wherever it was recorded!). A fun fact, I guess!